Security lock

ABSTRACT

A lock, ordinarily operable by a key from the outside and by a non-circular knob from the inside, is secured against being unlocked from the outside by picking or by a key. Such security is derived from a saddle which is held at end portions thereof in positions at approximately opposite points adjacent to said knob and has an intermediate portion in rotation-preventing engagement with the knob.

E'Uted States Patent Dusault, Jr. et a1.

SECURITY LOCK inventors: Raymond A. Dusault, Jr., 59 S.

Wyoming, Ave.; Frank R. Fasulo, 301 S. Orange Ave., both of South Orange, NJ. 07079 Filed: Oct. 13, 1971 Appl. No.: 188,719

U.S. Cl. 70/416, 70/447 Int. Cl E05b 13/00, E05b 17/00 Field of Search 70/416, 429, 430,

References Cited UNITED STATES PATENTS Griffith 70/429 X Primary Examiner-Robert L. Wolfe Att0meyLeon Chasan [57] ABSTRACT A lock, ordinarily operable by a key from the outside and by a non-circular knob from the inside, is secured against being unlocked from the outside by picking or by a key. Such security is derived from a saddle which is held at end portions thereof in positions at approximately opposite points adjacent to said knob and has an intermediate portion in rotation-preventing engagement with the knob.

3 Claims, 5 Drawing Figures PAIENTED JULB l 3, 748.8 82

sum 1 or 2 FIG. 3

INVENTORS: RAYMOND A. DUSAULT.JR FRANK R. FASULO I BY i A T TO/PNEV PATENTED JUL 3 I I973 SHEET 2 BF 2 INVENTORS: RAYMOND A.DUSAULT. JR. FRANK R. FASULO BY ATTORNEY SECURITY LOCK BACKGROUND OF THE INVENTION Rather conventional so-called dead bolts are commonly moved to locking position by turning a knob on the inner side of the door on which the lock is provided, and are openable from the outside of the door by a key. Even though an intruder may not be able to open the door by forcibly spreading the door jamb or by directly engaging the locks bolt with a tool to push it back to unlocking position, it is possible for the intruder to pick the lock and thus open the door.

If the lock be opened by picking or by the use of a surreptitiously obtained key, such opening is always accompanied by turning of the knob as a result of operation of the lock mechanism. The present invention is directed to the provision of very efficient, simple, and inexpensive means for directly holding the knob against turning, thereby preventing opening of the door from the outside by picking of the lock or by use of a key. The present invention provides security in a much more practical way than prior devices, all of which have been proven to be commercially and operatively impractical.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS The accompanying drawings, which illustrate the present invention, include:

FIG. 1, which is an elevational view of a security lock according to a preferred embodiment of this invention as seen at the inside of a related door; the locks knob being shown in full lines in its position as when the locks bolt is in extended or locked position, and said knob being shown in broken lines as when unlocked.

FIG. 2, which is a top plan view of the lock of FIG. 1, portions of the lock and a related door being broken away to show details.

FIG. 3, which is a side elevational view of the inside door portions of the lock of FIG. 1 as seen from the right side of the latter figure.

In the lock of FIGS. 1, 2 and 3, a security device according to this invention is combined integrally with the structure of the lock itself.

FIG. 4 is an inside-the-door elevational view of a modified form of security device according to this invention, combined with a lock as an accessory thereof, and

FIG. 5 is a fragmentary sectional view substantially on the line 5-5 of FIG. 4.

DETAILED DESCRIPTION OF THE LOCK OF FIGS. 1, 2 and 3 Referring to the first embodiment, illustrated in FIGS. 1, 2 and 3, the lock has an inside portion 10, an outside portion 12, and an inner cylinder 14 which is integrally associated with the outside portion 12 and protrudes into a bore 16 which extends through door 18 at a suitable distance from the latters free edge 20.

The locks outside portion includes an outer escutcheon plate 22, and its inside portion includes an inside escutcheon plate 24. Both plates 22 and 24 are of greater diameter than the bore 16, and the door 18 is tightly sandwiched between said plates by machine screws 26, all in a manner well known in the art.

The lock includes a slide bolt 28 extending through a protruding from a bore 30 and actuated by means (not shown) in or associated with the cylinder 14, all

' also in a manner well known in the art.

The locks inside portion 10 also, preferably, includes an oblong knob 32 having a stem 34, a reduced neck portion 36 which extends through a suitable bearing opening 38 in the escutcheon plate 24. A cap 40 is integrally connected to the neck portion to hold the knob and its just mentioned related parts rotatably in association with the plate 24. The knob 32, instead of having an oblong periphery, as illustrated, may have an otherwise irregularly shaped periphery to enable it to function and contribute to security as hereinafter explained.

A relatively rigid, rectangular finger 42, projecting from cylinder 14 toward the inner side of the door, extends into a complementally rectangular slot 44 in the stem 34. When key 46 is turned, not only does the bolt 28 slide in or out depending upon the direction of turning of the key, but the finger 42 and, hence, the knob 32 are both constrained to turn with the key. The door may be locked from the inside by turning of the knob 32 and may, ordinarily, be unlocked by the key from the outside.

The improvement of this invention provides security against opening of the lock from the outside by taking advantage of the fact that the knob is constrained to turn with the key; and recognizing that, if the knob be prevented from turning by means inside the door, a key can not be turned or the lock picked and operated from the outside.

The just indicated objective is accomplished by the arrangements illustrated in the accompanying drawings. As illustrated in FIGS. 1, 2 and 3, the inner escutcheon plate is enlarged to include an integral anchor plate 48 consisting chiefly of side members 50 and 52, respectively terminating in horizontally extending lugs 54 and 56, between which extends a saddle 58.

The saddle 58 is pivotally secured, at its left end, to the lug 54 by a pin 60 and, at its right end, it is supported upon the lug 56 and restrained against unintended dislodgement therefrom by an upwardly flared outer edge portion 56a of the latter lug.

It will be seen from FIG. 1 that, when the saddle 58 is supported by both lugs 54 and 56, it extends quite intimately underneath the knob 32 when the latter is in parallelism with a straight line projected between said lugs, as when the bolt 28 is in extended locking position. In that condition, the saddle 58, being adequately rigid for the purpose, positively prevents the knob 32 from being turned, thereby preventing the door from being unlocked from the outside.

When it is desired to release the saddle 58 so that the door may be opened either from the outside or inside, the saddle .is pivoted, about the pivot pin 60, horizon tally away from the door and clear of the knob 32 as indicated in broken lines in FIG. 2. In thus pivoting the saddle, its right end may easily be lifted or slid over the flared edge portion 56a of the lug 56 to free it from engag'ement with the latter. The inner edge of the right end of the saddle may be beveled as at 62 to facilitate restoration of the saddle to its security position.

DETAILED DESCRIPTION OF THE EMBODIMENT OF FIGS. 4 and 5.

The second embodiment (FIGS. 4 and 5) differs from the described first embodiment chiefly in that its anchor plate 48a is not integral with any part of the lock but is associated therewith merely by loosening the screws 26a of the escutcheon plate to enable said plate to be spaced temporarily from the door, after which the anchor plate 48a is slid into place between the door and the escutcheon plate and the screws 260 then tightened to clamp the anchor plate firmly in place. The anchor plate 48a may be provided with struck-back spurs 64 which become embedded into the door and thus prevent the anchor plate from turning.

The parts of the device of this invention in all embodiments should preferably be of suitable metal although it is conceivable that at least some parts thereof could be of other material while, nevertheless, still enabling the device to function substantially as described.

We claim:

1. A security device for a lock which is operable for locking and unlocking thereof by a key operable from the outside of a related door and by a knob having an oblong periphery and operable from the inside and said door and which includes an escutcheon plate positionable at the inner side of said door; said device comprising an anchor plate integral with said escutcheon plate and including opposite side members each including a lug extending approximately perpendicularly to the adjacent inner surface of said related door, and said device further comprising an elongate saddle fixedly pivo ted at one of its ends to one of said lugs for pivoting said saddle in a plane approximately perpendicular to said door surface and which saddle when the knob is in a locking position extends intimately alongside and has an intermediate portion shaped approximately complementally to the adjacent periphery of said knob to rest in such restraining engagement at its other end upon the other of said lugs-as to be held against said knob in a security position of said saddle to limit turning of the knob to an extent material to the operation of the lock, said saddle being sufficiently resistant to deformation to afford said limitation to turning of the knob.

2. A security device for a lock which is operable for locking and unlocking thereof by a key operable from the outside of a related door and by a knob having an irregular periphery and operable from the inside of said door and which includes an escutcheon plate positionable at the inner side of said door; said device comprising an anchor plate separate from said lock but fixedly associated with portions of said lock which are located at the inside of said door by being clamped between the door and said escutcheon plate, said anchor plate including side members extending toward areas at opposite sides of said knob, and further comprising an elongate saddle fixedly pivoted at one of its ends to one of said side members and which saddle when the knob is in a locking position extends from said one side member intimately alongside said knob and into such restraining engagement at its other end with the other of said side members as to be held against said knob in a security position of said saddle to limit turning of the knob to an extent material to the operation of the lock.

3. A security device for a lock which is operable for locking and unlocking thereof by a key operable from the outside of a related door and by a knob having an irregular periphery and operable from the inside of said door; said device comprising an anchor plate fixedly associated with portions of said lock which are located at the inside of the door, said anchor plate including opposite side members each incluing a lug extending approximately perpendicularly to the adjacent inner surface of said related door, and said device further comprising an elongate saddle fixedly pivoted at one of its ends to one of said lugs for pivoting said saddle in a plane approximately perpendicular to said door surface and which saddle when the knob is in a locking position extends intimately alongside said knob to rest in such restraining engagement at its other end upon the other of said lugs as to be held against said knob in a security position of said saddle to limit turning of the knob to an extent material to the operation of the lock, said saddle being sufficiently resistant to deformation to afford said limitation to turning of the knob and said other of said lugs having an upwardly flared outer edge portion restraining said other end of said saddle against unintended dislodgement from the last mentioned lug. =k 

1. A security device for a lock which is operable for locking and unlocking thereof by a key operable from the outside of a related door and by a knob having an oblong periphery and operable from the inside and said door and which includes an escutcheon plate positionable at the inner side of said door; said device comprising an anchor plate integral with said escutcheon plate and including opposite side members each including a lug extending approximately perpendicularly to the adjacent inner surface of said related door, and said device further comprising an elongate saddle fixedly pivoted at one of its ends to one of said lugs for pivoting said saddle in a plane approximately perpendicular to said door surface and which saddle when the knob is in a locking position extends intimately alongside and has an intermediate portion shaped approximately complementally to the adjacent periphery of said knob to rest in such restraining engagement at its other end upon the other of said lugs as to be held against said knob in a security position of said saddle to limit turning of the knob to an extent material to the operation of the lock, said saddle being sufficiently resistant to deformation to afford said limitation to turning of the knob.
 2. A security device for a lock which is operable for locking and unlocking thereof by a key operable from the outside of a related door and by a knob having an irregular periphery and operable from the inside of said door and which includes an escutcheon plate positionable at the inner side of said door; said device comprising an anchor plate separate from said lock but fixedly associated with portions of said lock which are located at the inside of said door by being clamped between the door and said escutcheon plate, said anchor plate including side members extending toward areas at opposite sides of said knob, and further comprising an elongate saddle fixedly pivoted at one of its ends to one of said side members and which saddle when the knob is in a locking position extends from said one side member intimately alongside said knob and into such restraining engagement at its other end with the other of said side members as to be held against said knob in a security position of said saddle to limit turning of the knob to an extent material to the operation of the lock.
 3. A security device for a lock which is operable for locking and unlocking thereof by a key operable from the outside of a related door and by a knob having an irregular periphery and operable from the inside of said door; said device comprising an anchor plate fixedly associated with portions of said lock which are located at the inside of the door, said anchor plate including opposite side members each incluing a lug extending approximately perpendicularly to the adjacent inner surface of said related door, and said device further comprising an elongate saddle fixedly pivoted at one of its ends to one of said lugs for pivoting said saddle in a plane approximately perpendicular to said door surface and which saddle when the knob is in a locking position extends intimately alongside said knob to rest in such restraining engagement at its other end upon the other of said lugs as to be held against said knob in a security position of said saddle to limit turning of the knob to an extent material to the operation of the lock, said saddle being sufficiently resistant to deformation to afford said limitation to turning of the knob and said other of said lugs having an upwardly flared outer edge portion restraining said other end of said saddle against unintended dislodgement from the last mentioned lug. 